US3795471A - Apparatus for shaping hollow extrudates of a plastic material - Google Patents

Apparatus for shaping hollow extrudates of a plastic material Download PDF

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Publication number
US3795471A
US3795471A US00231520A US3795471DA US3795471A US 3795471 A US3795471 A US 3795471A US 00231520 A US00231520 A US 00231520A US 3795471D A US3795471D A US 3795471DA US 3795471 A US3795471 A US 3795471A
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US
United States
Prior art keywords
band
extrudate
shaping
hollow
mold
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Expired - Lifetime
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US00231520A
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English (en)
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G Milani
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AMUNT SpA
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AMUNT SpA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
    • B29C59/043—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for profiled articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/224—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length having a profiled section, e.g. tubes, rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0015—Making articles of indefinite length, e.g. corrugated tubes
    • B29C49/0021—Making articles of indefinite length, e.g. corrugated tubes using moulds or mould parts movable in a closed path, e.g. mounted on movable endless supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/40—Plastics, e.g. foam or rubber
    • B29C33/405—Elastomers, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip

Definitions

  • ABSTRACT An apparatus for impressing fancy patterns onthe outer surface of extrudates of a plastic material, particularly a thermoplastic material.
  • a continuous band or web is inserted between a mould wall and the extrudate outer surface and is fed forward concurrently with the extrudate, negative pressure being employed to imprint on the extrudate the desired patterns which are reproduced on the continuously advancing web or band.
  • the band or web is either porous or foraminous.
  • Difficulties are known in obtaining such desired surface characteristics, with particular reference to matt, rough, engraved or substantially smooth surfaces on thermoplastic products which are continuously extruded in hot conditions.
  • the problem can be readily solved since it is satisfactory to engrave the mould surface with the desired pattern, or, as an alternative, to smooth it to any desired degree.
  • a still present problem is that of continuous extrudates, which are hollow and which would be crushed under a calendar.
  • the continuous extrusion of hollow shapes of thermoplastic materials uses vacuum-forming devices, having the shape of the profile, in which the atmospheric pressure in the extrudate hollow space causes the outside wall of the extrudate to stick to the walls of the shaping device, causing the extrudate to take the shape thereof.
  • the walls of the shaping devices should be smooth, at least longitudinally, since the plastic material should be allowed to slide thereover.
  • an irregularity is found in sliding of the material along the shaping device'walls, such as due to variations of physical parameters, such as temperature, friction coefficient, viscosity and the like, of the material during progress of setting.
  • This invention has as its object to permit the continuous shaping of a hollow thermoplastic profile by overcoming the above enumerated drawbacks as to the sliding of the extrudate along the shaping device walls, as well as to effect the impression under the effect of atmospheric pressure, of the desired patterns on the outer surfaces of the hollow extrudate or at least on a portion thereof.
  • the invention contemplates a device for the continuous shaping of hollow thermoplastic profiles, characterized in that the extrudate is caused to pass, when in its still deformable state, through a shaping mould of the negative pressure type, which is itself conventional, but previously inserting, between at least a portion of the mould inner walls and the outer walls of the extrudate, at least a shaping band having the desired patterns on its surface (for example, smooth surfaces, knurlings, grooves and the like), said band being intended to slide over the mould wall and to be fed forward continuously and at the same speed as the extrudate being formed, on which said patterns are reproduced by impression.
  • a shaping mould of the negative pressure type which is itself conventional, but previously inserting, between at least a portion of the mould inner walls and the outer walls of the extrudate, at least a shaping band having the desired patterns on its surface (for example, smooth surfaces, knurlings, grooves and the like), said band being intended to slide over the mould wall and to be fed forward continuously and at the same speed as the extru
  • the shaping band carrying the required patterns, can be provided both as a closed loop or an open loop and can drive the extrudate forward, if positively driven, or can they be driven by the extrudate if the latter is driven forward by other means.
  • the bands should be made of a pervious material or they should be pinholed. If so, paper, felt and like materials can be used as the material for the bands.
  • the band covers only restricted areas of the extrudate surface and thus does not cause a substantial decrease of the effect of the negative pressure in the shaping mould
  • the band can also be made of an impervious material, such as a metallic or a plastic material which is incompatible in hot conditions with the material of the extrudate.
  • FIG. 1 is a longitudinal cross-sectional view of the shaping mould for a hollow extrudate according to the invention
  • FIG. 2 is a cross-sectional view thereof, taken along line llll of FIG. 1.
  • the apparatus shown in the drawing is effective for shaping a tubular, flattened section, having on its outer surface, for example, knurlings.
  • the mould consists of two hollow plates 3-4 (thermostatically controlled if necessary), having inside walls provided with pinholes or tiny through holes 7 which, opening into the chambers 5-5 permit, by the use of an appropriate pump (not shown) the connected to the fittings 6-6, to impart a negative pressure to the extrudate-shaping surfaces.
  • bands 9, 9 are caused to slide, band 9 being in the form of a closed loop, running between the rollers 10-10 while band 9 is an open loop which can be paid off from a roller and taken up by another roller, both rollers not being shown.
  • said bands mask the major surfaces of the extrudate on which the nega tive pressure is to act, they are made of a porous material, such as paper, felt and the like, or, at any rate, they are pinholed. Between said bands, which are called the shaping bands and carry on their surfaces the desired patterns, the hollow extrudate of plastic material, 1, is caused to pass in a deformable state which, upon shaping and imprinting, emerges from the opposite end in the form of a shaped hollow body 2.
  • the shaping bands can be entrained both by the extrudate surface itself or they can be positively driven by motive means. If the bands are driven by motive means, they can act, themselves, as driving mechanisms for the extrudate.
  • the motive means (not shown) can be coupled to the idle roller 10.
  • the hollow plastic material 1 in the state of plasticity and capable of being shaped, is compressed, by virtue of the negative pressure impressed by the pump, by the agency of the atmospheric pressure obtaining in its interior, against the web-like walls which are displaced at the same speed as the extrudate and imprint the patterns thereon.
  • the plates as in the example shown, can be equipped with ducts 8 for circulating fluids at appropriate temperatures for a satisfactory shaping and an appropriate setting of the plastic material.
  • each of said bands could be split into a plurality of coplanar parallel webs, especially when extrudates having a considerable width are involved. It is also possible to partition each band longitudinally into a plurality of sequentially ordered members, which can possibly be spaced apart from each other.
  • Apparatus for the continuous formation of hollow extrudates of thermoplastic material having a patterned surface comprising, a shaping mold including opposed hollow members having confronting walls between which the hollow extrudate is adapted to pass while still hot, said confronting walls of the respective hollow members being perforated, means for producing suction pressure within said hollow members, means at least one shaping band extending through said mold between one of said confronting walls and said extrudate, said shaping band having a surface facing the extrudate to form a desired surface pattern thereon, said band being constructed to permit application therethrough of suction pressure to said extrudate whereby the extrudate is urged into contact with the band, and means for advancing the band and the extrudate through the mold at the same speed.
  • Apparatus as claimed in claim 1 wherein said means for advancing the band and extrudate comprises means for driving the band which causes said band to advance and the extrudate to advance therewith.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US00231520A 1971-03-05 1972-03-03 Apparatus for shaping hollow extrudates of a plastic material Expired - Lifetime US3795471A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2139571 1971-03-05

Publications (1)

Publication Number Publication Date
US3795471A true US3795471A (en) 1974-03-05

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Family Applications (1)

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US00231520A Expired - Lifetime US3795471A (en) 1971-03-05 1972-03-03 Apparatus for shaping hollow extrudates of a plastic material

Country Status (13)

Country Link
US (1) US3795471A (pt)
AT (1) AT334070B (pt)
BE (1) BE780218A (pt)
BR (1) BR7201278D0 (pt)
CA (1) CA964421A (pt)
CH (1) CH550651A (pt)
DE (1) DE2209895A1 (pt)
ES (1) ES400983A1 (pt)
FR (1) FR2128509B1 (pt)
GB (1) GB1383923A (pt)
NL (1) NL7202693A (pt)
SE (1) SE382584B (pt)
ZA (1) ZA721376B (pt)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221556A (en) * 1977-01-12 1980-09-09 K.C.E. Kiss Consulting Engineers, Verfahrenstechnik Gmbh Apparatus for fabricating preformed objects from lignocellulose matted fiber fabrics
EP0325169A1 (de) * 1988-01-16 1989-07-26 Röchling Haren Kg Verfahren und Formvorrichtung zur Herstellung von stranggezogenen Profilkörpern
US5112553A (en) * 1989-09-04 1992-05-12 Polyplastics Co., Ltd. Improvement in injection molded articles having three dimensional surfaces
WO2000012292A1 (en) * 1998-08-28 2000-03-09 General Electric Company Apparatus and process for texturing a thermoplastic extrudate
WO2001086743A2 (en) * 2000-05-10 2001-11-15 Ballard Power Systems, Inc. Method and apparatus for embossing expanded graphite sheet material under reduced pressure
US6368098B2 (en) * 1998-02-04 2002-04-09 Roehm Gmbh Chemische Fabrik Apparatus for the calibration of hollow chamber sheet extruded lines
US20050112418A1 (en) * 1996-06-07 2005-05-26 Roberts Joy A. Apparatus for improving the cold starting capability of an electrochemical fuel cell
US20100119755A1 (en) * 2008-11-11 2010-05-13 University Of Florida Research Foundation, Inc. Method of patterning a surface and articles comprising the same
US20100126404A1 (en) * 2004-02-17 2010-05-27 University Of Florida Research Foundation, Inc. Surface Topographies for Non-Toxic Bioadhesion Control
US20100226943A1 (en) * 2004-02-17 2010-09-09 University Of Florida Surface topographies for non-toxic bioadhesion control
US20110023393A1 (en) * 2009-07-31 2011-02-03 Steven Hartman Cornice
EP2535077A2 (en) * 2011-06-15 2012-12-19 University of Florida Research Foundation, Inc. Catheter for antimicrobial control and method of manufacturing thereof
CN105599313A (zh) * 2016-03-03 2016-05-25 大连塑料研究所有限公司 双层对接多边立体结构板生产工艺、连续生产成型设备及结构板

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2908487A1 (de) * 1979-03-05 1980-09-11 Roehm Gmbh Extrudierter hohlprofilstrang aus thermoplastischem kunststoff mit oberflaechenstruktur
DE4022582C2 (de) * 1990-07-16 1998-01-29 Neu Werner Verfahrenstech Vorrichtung zur Herstellung von plattenförmigen Kunststofformteilen
DE102021124673A1 (de) 2021-09-23 2023-03-23 OSRAM CONTINENTAL GmbH Vorrichtung und Verfahren zur Strangpressextrusion mit anschließender Geometrieänderung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783175A (en) * 1952-11-07 1957-02-26 Decora Corp Method for forming three dimensional patterns in textile material
US3099043A (en) * 1961-10-27 1963-07-30 Phillips Petroleum Co Method and apparatus for vacuum forming hollow articles
US3178494A (en) * 1962-11-15 1965-04-13 Lucien E Tisdale Method and apparatus for forming longitudinal corrugations in sheet material
US3350484A (en) * 1965-03-01 1967-10-31 Riegel Paper Corp Method and apparatus for making battery separators and the like

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783175A (en) * 1952-11-07 1957-02-26 Decora Corp Method for forming three dimensional patterns in textile material
US3099043A (en) * 1961-10-27 1963-07-30 Phillips Petroleum Co Method and apparatus for vacuum forming hollow articles
US3178494A (en) * 1962-11-15 1965-04-13 Lucien E Tisdale Method and apparatus for forming longitudinal corrugations in sheet material
US3350484A (en) * 1965-03-01 1967-10-31 Riegel Paper Corp Method and apparatus for making battery separators and the like

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221556A (en) * 1977-01-12 1980-09-09 K.C.E. Kiss Consulting Engineers, Verfahrenstechnik Gmbh Apparatus for fabricating preformed objects from lignocellulose matted fiber fabrics
EP0325169A1 (de) * 1988-01-16 1989-07-26 Röchling Haren Kg Verfahren und Formvorrichtung zur Herstellung von stranggezogenen Profilkörpern
US5112553A (en) * 1989-09-04 1992-05-12 Polyplastics Co., Ltd. Improvement in injection molded articles having three dimensional surfaces
US20050112418A1 (en) * 1996-06-07 2005-05-26 Roberts Joy A. Apparatus for improving the cold starting capability of an electrochemical fuel cell
US6368098B2 (en) * 1998-02-04 2002-04-09 Roehm Gmbh Chemische Fabrik Apparatus for the calibration of hollow chamber sheet extruded lines
US20020041052A1 (en) * 1998-02-04 2002-04-11 Roehm Gmbh Chemische Fabrik Apparatus for the calibration of hollow chamber sheet extruded lines
US6680022B2 (en) * 1998-02-04 2004-01-20 Roehm Gmbh & Co. Kg Apparatus for the calibration of hollow chamber sheet extruded lines
WO2000012292A1 (en) * 1998-08-28 2000-03-09 General Electric Company Apparatus and process for texturing a thermoplastic extrudate
US6132200A (en) * 1998-08-28 2000-10-17 General Electric Co. Apparatus and process for texturing a thermoplastic extrusion
WO2001086743A2 (en) * 2000-05-10 2001-11-15 Ballard Power Systems, Inc. Method and apparatus for embossing expanded graphite sheet material under reduced pressure
WO2001086743A3 (en) * 2000-05-10 2003-01-23 Ballard Power Systems Method and apparatus for embossing expanded graphite sheet material under reduced pressure
US6797091B2 (en) 2000-05-10 2004-09-28 Ballard Power Systems Inc. Method for embossing expanded graphite sheet material under reduced pressure
US20100226943A1 (en) * 2004-02-17 2010-09-09 University Of Florida Surface topographies for non-toxic bioadhesion control
US9016221B2 (en) 2004-02-17 2015-04-28 University Of Florida Research Foundation, Inc. Surface topographies for non-toxic bioadhesion control
US20100126404A1 (en) * 2004-02-17 2010-05-27 University Of Florida Research Foundation, Inc. Surface Topographies for Non-Toxic Bioadhesion Control
US8997672B2 (en) 2004-02-17 2015-04-07 University Of Florida Research Foundation, Inc. Surface topographies for non-toxic bioadhesion control
US20100119755A1 (en) * 2008-11-11 2010-05-13 University Of Florida Research Foundation, Inc. Method of patterning a surface and articles comprising the same
US11383426B2 (en) 2008-11-11 2022-07-12 University Of Florida Research Foundation, Inc. Method of patterning a surface and articles comprising the same
US10150245B2 (en) 2008-11-11 2018-12-11 University Of Florida Research Foundation, Inc. Method of patterning a surface and articles comprising the same
US20110023393A1 (en) * 2009-07-31 2011-02-03 Steven Hartman Cornice
EP2535077A2 (en) * 2011-06-15 2012-12-19 University of Florida Research Foundation, Inc. Catheter for antimicrobial control and method of manufacturing thereof
AU2012203477B2 (en) * 2011-06-15 2016-12-15 University Of Florida Research Foundation, Inc. Catheter for Antimicrobial Control and Method of Manufacturing thereof
US9937655B2 (en) * 2011-06-15 2018-04-10 University Of Florida Research Foundation, Inc. Method of manufacturing catheter for antimicrobial control
EP2535077A3 (en) * 2011-06-15 2012-12-26 University of Florida Research Foundation, Inc. Catheter for antimicrobial control and method of manufacturing thereof
US10625465B2 (en) 2011-06-15 2020-04-21 Sharklet Technologies, Inc. Catheter for antimicrobial control and method of manufacturing thereof
US20120319325A1 (en) * 2011-06-15 2012-12-20 University Of Florida Research Foundation, Inc. Catheter for antimicrobial control and method of manufacturing thereof
US11491700B2 (en) 2011-06-15 2022-11-08 Sharklet Technologies, Inc. Method of manufacturing catheter for antimicrobial control
CN105599313A (zh) * 2016-03-03 2016-05-25 大连塑料研究所有限公司 双层对接多边立体结构板生产工艺、连续生产成型设备及结构板

Also Published As

Publication number Publication date
CH550651A (it) 1974-06-28
ES400983A1 (es) 1975-02-01
CA964421A (en) 1975-03-18
FR2128509B1 (pt) 1976-01-16
DE2209895A1 (de) 1972-09-14
SE382584B (sv) 1976-02-09
FR2128509A1 (pt) 1972-10-20
ATA169072A (de) 1976-04-15
NL7202693A (pt) 1972-09-07
BE780218A (fr) 1972-07-03
ZA721376B (en) 1972-11-29
AT334070B (de) 1976-12-27
BR7201278D0 (pt) 1973-08-23
GB1383923A (en) 1974-02-12

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